I have written to Mark Prisk about this and he has written to Govia with the following letter.
I have also written to Govia and am awaiting a reply.

Dear Mr Horton,
Re: Hertford Loop and May Timetable
I am writing to strongly complain about the new timetable for commuting at Hertford North. It represents a worse service than now.
Why have you cut two of the five peak time morning trains? Changes to semi-fast services are also being reduced.
Why aren’t class 717 carriages being used on the loop? They have been advertised, yet in truth we are only getting refurbished 313s.
Given the increase in fares and the promises made, you will understand that Hertford North passengers feel your company has taken them for granted.
Can you please explain why this reduction in service and quality has been made? How would you seek to rectify this?
Yours sincerely,
Mark Prisk MP

There are currently 6 trains between 7 and 8. The 713, 720, 728, 734, 746 and 751. I also wouldn't say semi fast services are being reduced - they've been removed completely (which is my biggest issue with the new timetable).

I beg to differ. The new trains are being touted as something very special and they should be given there's about 40 years in age difference. What folks are complaining about is that the length of their commute has increased by 25%. Think on that. 40 years on and the trains are 25% slower. What used to take just over 40 minutes is now going to take comfortably 50 or more. I had used the HFN service for 16 years solid but decided to switch to HFE as I realised that in the scheme of things I'd rather use my debit card at both ends to pay, extra fast and convenient, could get a paper and a proper bacon sandwich (Gays/Rosies) on the way, have a guaranteed block of four seats to start off in, many a time with a little bijou table or shelf, always with 2 extra coaches and toilets. Cheaper too at 16.00. Neither TOC is up to much, but GoNowhere are the more annoying in terms of service delivery I find. There are times when the HFE service could be better, but it's usually track/signals rather than work to rules, overtime bans etc.